| Fighter | Record | Last Bout |
|---|---|---|
| David Michaud | 11-3-0 | 2015-04-25 |
| David Mitchell | 22-7-0 | 2013-10-09 |
| Demian Maia | 28-11-0 | 2021-06-12 |
| Dokonjonosuke Mishima | 21-7-2 | 2007-04-05 |
| Don Madge | 9-3-1 | 2019-09-07 |
| Dong Hyun Ma | 16-11-3 | 2019-12-21 |
| Drew McFedries | 12-7-0 | 2009-09-19 |
| Eddie Mendez | 8-3-1 (1 NC) | 2013-06-08 |
| Eiji Mitsuoka | 18-9-2 | 2012-08-11 |
| Eliot Marshall | 10-4-0 | 2011-10-29 |
| Elvis Mutapcic | 15-6-1 | 2016-12-03 |
| Emil Meek | 9-5-1 (1 NC) | 2020-02-22 |
| Enrique Marin | 10-4-0 | 2016-07-09 |
| Eric Martin | 0-1-0 | 1997-02-07 |
| Erick Montano | 7-5-0 | 2016-11-05 |
| Fabio Maldonado | 23-11-0 | 2015-11-07 |
| Felix Lee Mitchell | 2-7-0 | 1996-12-07 |
| Flavio Luiz Moura | 19-7-0 | 1999-07-16 |
| Francesco Maturi | 0-1-0 | 1995-09-08 |
| Frank Mir | 18-11-0 | 2016-03-19 |
| Gan McGee | 13-5-0 | 2003-09-26 |
| Garreth McLellan | 13-6-0 | 2017-03-11 |
| Gegard Mousasi | 42-6-2 | 2017-04-08 |
| Gilbert Melendez | 22-8-0 | 2019-07-06 |
| Gina Mazany | 7-6-0 | 2022-04-30 |
| Glaico Franca Moreira | 15-5-0 | 2016-09-24 |
| Gray Maynard | 13-7-1 (1 NC) | 2018-10-06 |
| Guy Mezger | 30-14-2 | 1999-03-05 |
| Harry Moskowitz | 6-12-0 | 1998-05-15 |
| Henry Martinez | 9-4-0 | 2012-12-08 |
| Homer Moore | 26-9-2 | 2001-11-02 |
| Humberto Brown Morrison | 4-6-0 | 2014-11-15 |
| Ian McCall | 13-5-1 | 2015-01-31 |
| Ikuhisa Minowa | 60-42-8 | 2000-04-14 |
| Ivan Menjivar | 25-12-0 | 2014-03-01 |
| Jack Marshman | 23-10-0 | 2020-10-31 |
| Jack May | 9-3-0 | 2014-08-16 |
| Jack McGlaughlin | 1-4-0 | 1995-07-14 |
| James McSweeney | 15-15-0 | 2010-10-16 |
| James Moontasri | 9-5-0 | 2016-12-17 |
| James Mulheron | 11-2-0 | 2017-07-16 |
| Jamie Moyle | 4-3-0 | 2018-07-07 |
| Jason MacDonald | 25-16-0 | 2012-05-15 |
| Jason Miller | 23-10-0 (1 NC) | 2012-05-26 |
| Jeff Molina | 11-2-0 | 2022-06-04 |
| Jeff Monson | 60-26-1 | 2006-11-18 |
| Jennifer Maia | 21-10-1 | 2023-10-14 |
| Jim Mullen | 0-2-0 | 1997-02-07 |
| Jimi Manuwa | 17-6-0 | 2019-06-01 |
| Joe Merritt | 7-2-0 | 2015-06-27 |